T-Sql 递归查询
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T-Sql 递归查询
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使用CTE查詢遞歸層級：(Sql CTE Recursion)
1 WITH CTE_MA AS 2 ( 3 SELECT 0 AS Tier, EmployeeID, ManagerID, FirstName, LastName 4 FROM dbo.MyEmployees 5 WHERE EmployeeID = 1 6 UNION ALL 7 SELECT a.Tier+1 AS Tier, e.EmployeeID, e.ManagerID, e.FirstName, e.LastName 8 FROM dbo.MyEmployees e 9 INNER JOIN CTE_MA a ON e.ManagerID = a.EmployeeID 10 ) 11 SELECT * FROM CTE_MA?
Tier EmployeeID ManagerID FirstName LastName ----------- ---------- ----------- ------------------------------ ---------------------------------------- 0 1 NULL Ken Sánchez 1 273 1 Brian Welcker 2 16 273 David Bradley 2 274 273 Stephen Jiang 2 285 273 Syed Abbas 3 286 285 Lynn Tsoflias 3 275 274 Michael Blythe 3 276 274 Linda Mitchell 3 23 16 Mary Gibson轉載于:https://www.cnblogs.com/learnmoredaybyday/p/4211435.html
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